2 Queries please

Hi all
I am completely new to the VHDL
I use modelsim SE6.4 revision 2008.06

I have 2 queries please
First - When I start simulation of the entity and architecture below - some times the signals my_in1 ,... I see them on the object menu ready to be copied to the waveform and sometimes I dont see them (I am sure that I m doing something wrong sometimes)

Can you suggest me a test bench (that changes the clock) for the circuit I below?

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